CN114736412A - Coating type BOPP (biaxially-oriented Polypropylene) embossable pre-coated film and preparation method thereof - Google Patents
Coating type BOPP (biaxially-oriented Polypropylene) embossable pre-coated film and preparation method thereof Download PDFInfo
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- CN114736412A CN114736412A CN202210356853.3A CN202210356853A CN114736412A CN 114736412 A CN114736412 A CN 114736412A CN 202210356853 A CN202210356853 A CN 202210356853A CN 114736412 A CN114736412 A CN 114736412A
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- 239000011127 biaxially oriented polypropylene Substances 0.000 title claims abstract description 68
- 229920006378 biaxially oriented polypropylene Polymers 0.000 title claims abstract description 67
- 239000011248 coating agent Substances 0.000 title claims abstract description 41
- 238000000576 coating method Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title abstract description 17
- 239000010410 layer Substances 0.000 claims abstract description 89
- 239000004831 Hot glue Substances 0.000 claims abstract description 55
- 239000011247 coating layer Substances 0.000 claims abstract description 38
- 229920002635 polyurethane Polymers 0.000 claims abstract description 28
- 239000004814 polyurethane Substances 0.000 claims abstract description 28
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 22
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 22
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920000642 polymer Polymers 0.000 claims abstract description 21
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 19
- -1 dimethyl triphenyl ethyl sulfonic acid isonitrile Chemical compound 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 239000011347 resin Substances 0.000 claims abstract description 17
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000013329 compounding Methods 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 4
- 150000002148 esters Chemical class 0.000 claims abstract description 4
- 238000003851 corona treatment Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 14
- 238000009966 trimming Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000010345 tape casting Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000010030 laminating Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 229920006255 plastic film Polymers 0.000 description 4
- 229920005749 polyurethane resin Polymers 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 150000002527 isonitriles Chemical class 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000007719 peel strength test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
- C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09J123/0853—Vinylacetate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/241—Polyolefin, e.g.rubber
- C09J7/243—Ethylene or propylene polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
Abstract
The invention discloses a coating type BOPP (biaxially-oriented Polypropylene) pre-coated film capable of being embossed, which comprises a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged; the raw materials of the hot melt adhesive layer comprise ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin; the coating layer is prepared from a modified polyurethane solution, and the modified polyurethane solution is prepared by reacting the following raw materials in a solvent: polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile acid ester and maleic anhydride. The invention also discloses a preparation method of the pre-coating film. The invention solves the technical problems of insufficient binding power, insufficient compounding fastness and high use temperature of the common laminating film in the prior art, and the prepared precoating film can obviously improve the compounding fastness with paper.
Description
Technical Field
The invention relates to the technical field of films, in particular to a coating type BOPP (biaxially-oriented polypropylene) pre-coated film capable of being embossed and a preparation method thereof.
Background
The pre-coating film is a process of pre-gluing and rewinding a plastic film and then compounding the plastic film with a paper printing product. The pre-coating film processing plant is used to coat glue solution on film according to the use specification and breadth, then the film is rewound for the manufacturer to select, and then the film is compounded with printed matter.
The film-covered, i.e. film-sticking, is a processing technique for coating adhesive on the plastic film, and then the plastic film and the paper printed matter are heated and pressurized to be adhered together to form a paper-plastic integrated product.
In the fields of super-sticky and digital application, high-requirement patterns are usually coated with films so as to improve the surface glossiness and fastness of products, prolong the service life of the products, play the protection roles of water resistance, pollution resistance, wear resistance, folding resistance and the like, and improve the aesthetic feeling of product design; however, in the field of digital laminating, due to the required picture effects such as frosting, unevenness and the like after cold pressing and hot pressing, the common laminating is easy to have the phenomena of insufficient compounding fastness, poor effects such as unevenness and the like, and the compounding effect is influenced; the prior pre-coating film product has generally higher use temperature, so that the conditions of overlarge heat shrinkage of a base film, wrinkle and the like are easy to occur in the film coating process.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a coating type BOPP (biaxially-oriented polypropylene) embossable pre-coated film and a preparation method thereof.
The invention provides a coating type BOPP (biaxially-oriented Polypropylene) pre-coated film capable of being embossed, which comprises a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged;
the raw materials of the hot melt adhesive layer comprise ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin;
the coating layer is prepared from a modified polyurethane solution, and the modified polyurethane solution is prepared by reacting the following raw materials in a solvent: polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile acid ester and maleic anhydride;
the base material layer is a base-coating-free biaxially oriented polypropylene film, and the base-coating-free biaxially oriented polypropylene film is composed of a biaxially oriented polypropylene film and a PE layer compounded on one surface of the film.
Preferably, the hot melt adhesive layer comprises the following raw materials in parts by mass: 85-100 parts of ethylene-vinyl acetate polymer and 5-15 parts of N, N-4, 4-diphenylmethane bismaleimide resin.
Preferably, the ethylene-vinyl acetate polymer has a melt index of 16-18g/10min at 190 ℃ under 2.16kg, wherein the content of vinyl acetate is 18 wt%.
Preferably, the modified polyurethane solution is prepared by reacting the following raw materials in a solvent: 80-90 parts of polyurethane prepolymer, 10-15 parts of dimethyl triphenyl ethyl sulfonic acid isonitrile ester and 1-5 parts of maleic anhydride.
Preferably, the preparation method of the modified polyurethane solution comprises the following steps: adding the polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile ester and maleic anhydride into a solvent, and stirring at normal temperature for reaction to obtain the polyurethane prepolymer.
Preferably, the solvent is prepared from water and absolute ethyl alcohol according to a volume ratio of (7-9): (1-3) mixing to obtain the product.
Preferably, the stirring reaction time is 20-40 min.
Preferably, the dry weight of the coating layer is 10 to 12mg/m2。
Preferably, the thickness of the substrate layer is 12-25 μm, and the thickness of the hot melt adhesive layer is 15-40 μm.
The preparation method of the coating type BOPP (biaxially-oriented Polypropylene) embossable pre-coating film comprises the following steps:
s1, unwinding the bottomless biaxially oriented polypropylene film;
s2, mixing an ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin, performing melt extrusion, and compounding the mixture to the surface of the PE layer of the base-coat-free biaxially oriented polypropylene film by a tape casting method to form a hot melt adhesive layer;
s3, after trimming and thickness measurement, performing high-frequency high-voltage corona treatment on the surface of the hot melt adhesive layer;
s4, coating the modified polyurethane solution on the surface of the hot melt adhesive layer subjected to corona treatment, drying to form a coating layer, trimming and measuring the thickness, and carrying out high-frequency high-voltage corona treatment on the surface of the coating layer to obtain the coating.
Preferably, in S2, the temperature of melt extrusion is 215-225 ℃.
Preferably, in S3, the power of the high-frequency high-voltage corona treatment is 15-20W/m2。
Preferably, in S4, the power of the high-frequency high-voltage corona treatment is 20-30W/m2。
The invention has the following beneficial effects:
1. the mixture of ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin is used as a raw material to prepare the hot melt adhesive layer, so that the melting temperature of the product is reduced while the original functional group bond energy and number of the hot melt adhesive layer are increased, and the problem of high use temperature of the product in the prior art is solved.
2. The surface of the hot melt adhesive layer is coated with a modified waterborne polyurethane coating layer, and the original bonds between groups can be enhanced and the number of functional groups can be increased under the action of maleic anhydride serving as a modifier and dimethyl triphenyl ethyl sulfonate isonitrile acid ester serving as dimethyl triphenyl ethyl sulfonate in waterborne polyurethane, so that the effect of enhancing the bonding performance is achieved, and the technical problems of insufficient bonding force and insufficient compound fastness of a common film in the prior art are solved.
3. Compared with the common biaxially oriented polypropylene film base material, the invention uses the primer-free biaxially oriented polypropylene film as the base film, does not need to use an adhesive to bond the EVA layer and the base material layer, reduces a series of quality problems of uneven adhesive fastness of gluing, undried bubbles and the like possibly generated by the adhesive, and ensures the adhesive fastness between the primer-free biaxially oriented polypropylene film base material layer and the required film-coated paper.
4. In the preparation process, the high-frequency corona treatment is carried out on the base material and the hot melt adhesive layer, so that the adsorption capacity of the surface of the base material and the surface of the hot melt adhesive layer are increased, and further, the bonding strength in the pre-coating film and the compounding fastness of the pre-coating film to a printing product are further increased.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
In the following examples and comparative examples, a baseless biaxially oriented polypropylene film was used having the designation BOPP15 available from Aiho, Fengyi industries, Inc.
The polyurethane prepolymer used was purchased from femto-second chemical industry, Anhui, under the designation 1935A.
The ethylene-vinyl acetate polymer adopted has a vinyl acetate content of 18 wt% and a melt index of 16-18g/10min at 190 ℃ under the condition of 2.16 kg.
Example 1
A coating type BOPP pre-coated film capable of being embossed comprises a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged; the hot melt adhesive layer comprises the following raw materials in parts by mass: 90 parts of ethylene-vinyl acetate polymer and 10 parts of N, N-4, 4-diphenylmethane bismaleimide resin; the coating layer is prepared from a modified polyurethane solution, wherein the modified polyurethane solution is obtained by reacting the following raw materials in parts by mass in a solvent: 85 parts of polyurethane resin, 12 parts of dimethyl triphenyl ethyl sulfonic acid isonitrile ester and 3 parts of maleic anhydride, wherein the solvent is obtained by mixing water and absolute ethyl alcohol according to a volume ratio of 8:2, and the preparation method comprises the following steps: adding the polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile ester and maleic anhydride into a solvent, and stirring and reacting for 30min at normal temperature to obtain the polyurethane prepolymer. The substrate layer is a bottomless biaxially oriented polypropylene film; the thickness of the substrate layer was 15 μm, the thickness of the hot-melt adhesive layer was 25 μm, and the dry weight of the coating layer was 11.5mg/m2。
The preparation method of the coating type BOPP pre-coating film capable of being embossed comprises the following steps:
s1, unwinding the bottomless biaxially oriented polypropylene film;
s2, mixing an ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin, performing melt extrusion at 220 ℃, and compounding the mixture to the surface of the PE layer of the primer-free biaxially oriented polypropylene film by a tape casting method to form a hot melt adhesive layer;
s3, after trimming and thickness measuring, carrying out high-frequency high-voltage corona treatment on the surface of the hot melt adhesive layer, wherein the high-frequency high-voltage corona treatment is carried out on the hot melt adhesive layerThe power of the medium-high frequency high-voltage corona treatment is 15W/m2；
S4, coating the modified polyurethane solution on the surface of the hot melt adhesive layer after corona treatment, drying to form a coating layer, trimming and measuring the thickness, and carrying out high-frequency high-voltage corona treatment on the surface of the coating layer, wherein the power of the high-frequency high-voltage corona treatment is 25W/m2And rolling and slitting.
Example 2
A coating type BOPP pre-coated film capable of being embossed comprises a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged; the hot melt adhesive layer comprises the following raw materials in parts by mass: 85 parts of ethylene-vinyl acetate polymer and 5 parts of N, N-4, 4-diphenylmethane bismaleimide resin; the coating layer is prepared from a modified polyurethane solution, wherein the modified polyurethane solution is prepared by reacting the following raw materials in parts by mass in a solvent: 80 parts of polyurethane prepolymer, 10 parts of dimethyl triphenyl ethyl sulfonic acid isonitrile ester and 1 part of maleic anhydride, wherein the solvent is obtained by mixing water and absolute ethyl alcohol according to a volume ratio of 8:2, and the preparation method comprises the following steps: adding the polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile ester and maleic anhydride into a solvent, and stirring and reacting for 30min at normal temperature to obtain the polyurethane prepolymer; the substrate layer is a bottomless biaxially oriented polypropylene film; the thickness of the substrate layer was 15 μm, the thickness of the hot-melt adhesive layer was 25 μm, and the dry weight of the coating layer was 10mg/m2。
The preparation method of the coating type BOPP (biaxially-oriented Polypropylene) embossable pre-coated film comprises the following steps:
s1, unwinding the bottomless biaxially oriented polypropylene film;
s2, mixing an ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin, performing melt extrusion at 220 ℃, and compounding the mixture to the surface of the PE layer of the base-coat-free biaxially oriented polypropylene film by a tape casting method to form a hot melt adhesive layer;
s3, after trimming and thickness measuring, carrying out high-frequency high-voltage corona treatment on the surface of the hot melt adhesive layer, wherein the power of the high-frequency high-voltage corona treatment is 15W/m2；
S4, coating the modified polyurethane solution on the surface of the hot melt adhesive layer after corona treatmentDrying to form a coating layer, trimming and measuring the thickness, and carrying out high-frequency high-voltage corona treatment on the surface of the coating layer, wherein the power of the high-frequency high-voltage corona treatment is 25W/m2And rolling and slitting.
Example 3
A coating type BOPP pre-coated film capable of being embossed comprises a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged; the hot melt adhesive layer comprises the following raw materials in parts by mass: 100 parts of ethylene-vinyl acetate polymer and 15 parts of N, N-4, 4-diphenylmethane bismaleimide resin; the coating layer is prepared from a modified polyurethane solution, wherein the modified polyurethane solution is prepared by reacting the following raw materials in parts by mass in a solvent: 90 parts of polyurethane prepolymer, 15 parts of dimethyl triphenyl ethyl sulfonic acid isonitrile ester and 5 parts of maleic anhydride, wherein the solvent is obtained by mixing water and absolute ethyl alcohol according to a volume ratio of 8:2, and the preparation method comprises the following steps: adding the polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile ester and maleic anhydride into a solvent, and stirring and reacting for 30min at normal temperature to obtain the polyurethane prepolymer. The substrate layer is a bottomless coating biaxially oriented polypropylene film; the thickness of the substrate layer was 15 μm, the thickness of the hot-melt adhesive layer was 25 μm, and the dry weight of the coating layer was 12mg/m2。
The preparation method of the coating type BOPP pre-coating film capable of being embossed comprises the following steps:
s1, unwinding the bottomless biaxially oriented polypropylene film;
s2, mixing an ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin, performing melt extrusion at 220 ℃, and compounding the mixture to the surface of the PE layer of the base-coat-free biaxially oriented polypropylene film by a tape casting method to form a hot melt adhesive layer;
s3, after trimming and thickness measuring, performing high-frequency high-voltage corona treatment on the surface of the hot melt adhesive layer, wherein the power of the high-frequency high-voltage corona treatment is 15W/m2；
S4, coating the modified polyurethane solution on the surface of the hot melt adhesive layer after corona treatment, drying to form a coating layer, trimming and measuring the thickness, and carrying out high-frequency high-voltage corona treatment on the surface of the coating layer, wherein the power of the high-frequency high-voltage corona treatment is 25W/m2And rolling and slitting.
Comparative example 1
A coating type BOPP (biaxially-oriented Polypropylene) embossable pre-coated film comprises a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged; the hot melt adhesive layer comprises the following raw materials: ethylene-vinyl acetate polymers; the coating layer is prepared from a modified polyurethane solution, wherein the modified polyurethane solution is obtained by reacting the following raw materials in parts by mass in a solvent: 85 parts of polyurethane resin, 12 parts of dimethyl triphenyl ethanesulfonic acid isonitrile ester and 3 parts of maleic anhydride, wherein the solvent is obtained by mixing water and absolute ethyl alcohol according to a volume ratio of 8:2, and the preparation method comprises the following steps: adding the polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile ester and maleic anhydride into a solvent, and stirring and reacting for 30min at normal temperature to obtain the polyurethane prepolymer. The substrate layer is a bottomless biaxially oriented polypropylene film; the thickness of the substrate layer was 15 μm, the thickness of the hot-melt adhesive layer was 25 μm, and the dry weight of the coating layer was 11.5mg/m2。
The preparation method of the coating type BOPP (biaxially-oriented Polypropylene) embossable pre-coated film comprises the following steps:
s1, unwinding the bottomless biaxially oriented polypropylene film;
s2, mixing an ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin, performing melt extrusion at 220 ℃, and compounding the mixture to the surface of the PE layer of the primer-free biaxially oriented polypropylene film by a tape casting method to form a hot melt adhesive layer;
s3, after trimming and thickness measuring, performing high-frequency high-voltage corona treatment on the surface of the hot melt adhesive layer, wherein the power of the high-frequency high-voltage corona treatment is 15W/m2；
S4, coating the modified polyurethane solution on the surface of the hot melt adhesive layer after corona treatment, drying to form a coating layer, trimming and measuring the thickness, and carrying out high-frequency high-voltage corona treatment on the surface of the coating layer, wherein the power of the high-frequency high-voltage corona treatment is 25W/m2And rolling and slitting.
Comparative example 2
A coating type BOPP (biaxially-oriented Polypropylene) embossable pre-coated film comprises a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged; the hot melt adhesive layer comprises the following substancesRaw materials in parts by weight: 90 parts of ethylene-vinyl acetate polymer and 10 parts of N, N-4, 4-diphenylmethane bismaleimide resin; the coating layer is prepared from a polyurethane solution, wherein the polyurethane solution is obtained by adding a polyurethane resin prepolymer into a solvent and stirring at normal temperature for 30min, and the solvent is obtained by mixing water and absolute ethyl alcohol according to a volume ratio of 8: 2; the substrate layer is a bottomless biaxially oriented polypropylene film; the thickness of the substrate layer was 15 μm, the thickness of the hot-melt adhesive layer was 25 μm, and the dry weight of the coating layer was 11.5mg/m2。
The preparation method of the coating type BOPP pre-coating film capable of being embossed comprises the following steps:
s1, unwinding the bottomless biaxially oriented polypropylene film;
s2, mixing an ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin, performing melt extrusion at 220 ℃, and compounding the mixture to the surface of the PE layer of the base-coat-free biaxially oriented polypropylene film by a tape casting method to form a hot melt adhesive layer;
s3, after trimming and thickness measuring, performing high-frequency high-voltage corona treatment on the surface of the hot melt adhesive layer, wherein the power of the high-frequency high-voltage corona treatment is 15W/m2；
S4, coating the modified polyurethane solution on the surface of the hot melt adhesive layer after corona treatment, drying to form a coating layer, trimming and measuring the thickness of the coating layer, and carrying out high-frequency high-voltage corona treatment on the surface of the coating layer, wherein the power of the high-frequency high-voltage corona treatment is 25W/m2And rolling and slitting.
Examples of the experiments
The precoat films obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to peel strength tests, and the results are shown in Table 1:
TABLE 1 Peel Strength of precoat film
Note: in the table, the peel strength 1 refers to the peel strength between the hot melt adhesive layer and a biaxially oriented polypropylene (BOPP) film in the pre-coated film; the peel strength 2 refers to the peel strength between the hot melt adhesive layer and the common paper in the pre-coated film; the peel strength 3 refers to the peel strength between the hot-melt adhesive layer and the high-ink paper in the pre-coated film.
As can be seen from the comparison among the examples 1, 2, 3 and the comparative examples in the above tables, the peel strength of the pre-coated film prepared by the present invention is significantly stronger than that of the comparative examples, so that the pre-coated film prepared by the present invention can significantly improve the compounding fastness with super-sticky paper.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The coating type BOPP pre-coated film capable of being embossed is characterized by comprising a base material layer, a hot melt adhesive layer and a coating layer which are sequentially arranged;
the raw materials of the hot melt adhesive layer comprise ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin;
the coating layer is prepared from a modified polyurethane solution, and the modified polyurethane solution is prepared by reacting the following raw materials in a solvent: polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile acid ester and maleic anhydride;
the base material layer is a base-coating-free biaxially oriented polypropylene film, and the base-coating-free biaxially oriented polypropylene film is composed of a biaxially oriented polypropylene film and a PE layer compounded on one surface of the film.
2. The coated BOPP pre-coated film capable of being embossed according to claim 1, wherein the hot melt adhesive layer comprises the following raw materials in parts by mass: 85-100 parts of ethylene-vinyl acetate polymer and 5-15 parts of N, N-4, 4-diphenylmethane bismaleimide resin.
3. The coated BOPP embossable pre-coat film according to claim 1 wherein the ethylene vinyl acetate polymer has a melt index of 16-18g/10min at 190 ℃ under 2.16kg, wherein the vinyl acetate content is 18 wt%.
4. The coated BOPP pre-coating film capable of being embossed according to claim 1, wherein the modified polyurethane solution is prepared by reacting the following raw materials in a solvent: 80-90 parts of polyurethane prepolymer, 10-15 parts of dimethyl triphenyl ethyl sulfonic acid isonitrile ester and 1-5 parts of maleic anhydride.
5. The coated BOPP pre-coating film capable of being embossed according to claim 1, wherein the modified polyurethane solution is prepared by a method comprising the following steps: adding the polyurethane prepolymer, dimethyl triphenyl ethyl sulfonic acid isonitrile ester and maleic anhydride into a solvent, and stirring at normal temperature for reaction to obtain the polyurethane prepolymer.
6. The coated BOPP embossable pre-coat film according to claim 1, wherein the dry weight of said coating layer is 10-12mg/m2。
7. The coated BOPP embossable pre-coat film according to claim 1 wherein the thickness of the substrate layer is 12-25 μ ι η; the thickness of the hot melt adhesive layer is 15-40 μm.
8. A method of producing a coated BOPP embossable pre-coat film according to any of the claims 1 to 7, comprising the steps of:
s1, unwinding the bottomless biaxially oriented polypropylene film;
s2, mixing an ethylene-vinyl acetate polymer and N, N-4, 4-diphenylmethane bismaleimide resin, performing melt extrusion, and compounding the mixture to the surface of the PE layer of the base-coat-free biaxially oriented polypropylene film by a tape casting method to form a hot melt adhesive layer;
s3, after trimming and thickness measurement, performing high-frequency high-voltage corona treatment on the surface of the hot melt adhesive layer;
s4, coating the modified polyurethane solution on the surface of the hot melt adhesive layer subjected to corona treatment, drying to form a coating layer, trimming and measuring the thickness, and carrying out high-frequency high-voltage corona treatment on the surface of the coating layer to obtain the coating.
9. The method for preparing a coated BOPP embossable pre-coat film according to claim 8 wherein the melt extrusion temperature in S2 is 215-225 ℃.
10. The method of preparing a coated BOPP embossable pre-coat film according to claim 8 wherein the power of the high frequency high voltage corona treatment in S3 is 15-20W/m2(ii) a In S4, the power of the high-frequency high-voltage corona treatment is 20-30W/m2。
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